CAJ | 학술논문

大气 CO2浓度升高引起的海洋酸化如何在光变环境下影响大型海藻固碳量的问题，关系到未来海洋初级生产力的变化趋势。为研究大型海藻对 CO2浓度升高和光强变化的响应，本文选取浒苔（Ulva prolifera ）幼苗为实验材料，探讨其在不同光强下[80、260μmol／（m2·s）]和两种 CO2浓度（正常 CO2浓度：400μL／L 和高 CO2浓度：1000μL／L）下的生理变化。研究发现，在正常 CO2浓度、高光条件下，浒苔幼苗的生长最快，超氧化物特化酶（SOD）活性最高，而过氧化氢酶（CAT ）活性在低光、高CO2处理下有最大值。光合色素含量和光系统Ⅱ的光化学效率在不同处理间没有显著性差异，但叶绿素 a 与类胡萝卜素的比值在低光正常 CO2处理下有最大值。同时，高光高 CO2处理下，浒苔幼苗的可溶性蛋白含量最低。
대기 CO2농도승고인기적해양산화여하재광변배경하영향대형해조고탄량적문제，관계도미래해양초급생산력적변화추세。위연구대형해조대 CO2농도승고화광강변화적향응，본문선취호태（Ulva prolifera ）유묘위실험재료，탐토기재불동광강하[80、260μmol／（m2·s）]화량충 CO2농도（정상 CO2농도：400μL／L 화고 CO2농도：1000μL／L）하적생리변화。연구발현，재정상 CO2농도、고광조건하，호태유묘적생장최쾌，초양화물특화매（SOD）활성최고，이과양화경매（CAT ）활성재저광、고CO2처리하유최대치。광합색소함량화광계통Ⅱ적광화학효솔재불동처리간몰유현저성차이，단협록소 a 여류호라복소적비치재저광정상 CO2처리하유최대치。동시，고광고 CO2처리하，호태유묘적가용성단백함량최저。
Ocean acidification due to increasing anthropogenic CO2 is expected to influence marine primary productiv-ity.In order to investigate the interactive effects of increased light and CO2 changes on macroalgae,we grewUlva prolifera seedling under the normal CO2 level (400 μL/L)and elevated CO2 level (1 000 μL/L)conditions,the light levels set as 80 and 260 μmol/(m2 ·s),and measured its physiological performance.Research finding that the specific growth rate and activity of SOD was highest under high light and normal CO2 level .However,the activity of CAT showed the highest value under the high CO2 and low light conditions.Under the different treatments, there was no significant effect on the chlorophyll a and maximal photochemical yield of PSⅡ (Fv/Fm ),while the largest ratios of chlorophylla to carotenoid occurred at nomal CO2 and low light conditions.Meanwhile,the content of soluble protein was decreased by high light and high CO2 .